In this question, we have to determine which option will fit best the polar covalent bond definition.
Covalent bonds are by definition a type of bonding in which we will have the share of electrons instead of donating, like ionic bonds. Polar covalent bonds still follow this definition but we will have an unequal sharing, one atom will end up pulling more of the electrons towards its own side, because this atom is more electronegative.
Therefore the best answer will be the 1st answer
